We have a King Dome automatic satellite dome on our motorhome. Our system is Bell Expressvu with two 5900 PVRs. It's been working fine for four years. Just last week we lost signal for several stations on the receiver-1, yet they all came in on receiver-2. Not only that, when receiver-2 was tuned to those missing channels, they miraculously worked on receiver-1. We checked out all our connections, rebooted both receivers, and switched them around but there was no change. Any help would be appreciated.